The rice stink bug, Oebalus pugnax (Fabricius) (Hemiptera: Pentatomidae: Carpocorini), though graminaceous, discriminates among its numerous host grass species. This could represent a feeding preference, it could be related to host suitability for growth and development. To clarify the role of host grass discrimination, two laboratory studies were conducted: (1) free‐choice tests to evaluate preferences of O. pugnax among 11 wild host grass species found in three rice‐producing counties of the central Mississippi Delta (MS, USA), and (2) no‐choice tests to evaluate the impact of rice (Oryza sativa L.), junglerice [Echinochloa colona (L.) Link], and dallisgrass (Paspalum dilatatum Poir.) (all Poaceae), on the development of O. pugnax from second instar to adult. In the free‐choice test, four experiments were conducted, each with four sets of host grass species and observed 1, 2, 4, 8, and 16 h after release in cages. Approximately 4 h was necessary for O. pugnax to settle on preferred host grasses. Oebalus pugnax showed a feeding preference for junglerice over all 10 other grass species. Bahiagrass, Paspalum notatum Flueggé, was the least preferred. The no‐choice tests showed significant effect of host grass species on O. pugnax mean development time of nymphal survival to adults. Survival of nymphs was lower and mean development time was longer on dallisgrass compared to rice and junglerice. Knowledge of O. pugnax rate of growth and development on host grasses could be useful in the future development of rice integrated pest management strategies.

中文翻译：

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草对 Oebalus pugnax 的寄主偏好和适宜性

水稻臭虫 Oebalus pugnax (Fabricius)（半翅目：五足科：Carpocorini）虽然禾本科，但在其众多寄主草种之间存在差异。这可能代表摄食偏好，它可能与宿主对生长和发育的适应性有关。为了阐明寄主草区分的作用，进行了两项实验室研究：（1）自由选择测试，以评估在密西西比河三角洲中部三个产稻县发现的 11 种野生寄主草种中 O. pugnax 的偏好（MS，美国)，和 (2) 无选择试验，以评估水稻 (Oryza sativa L.)、丛林稻 [Echinochloa colona (L.) Link] 和 dallisgrass (Paspalum dilatatum Poir.)（所有禾本科）对水稻的影响O. pugnax 从二龄到成年的发展。在自由选择测试中，进行了四个实验，每个都有四组寄主草种，并在笼中释放后 1、2、4、8 和 16 小时进行观察。O. pugnax 需要大约 4 小时才能在首选寄主草上定居。与所有其他 10 种草种相比，Oebalus pugnax 表现出对丛林草的偏好。Bahiagrass，Paspalum notatum Flueggé，是最不受欢迎的。无选择试验表明寄主草种对 O. pugnax 若虫存活至成虫的平均发育时间有显着影响。与水稻和丛林稻相比，若虫的存活率较低，且稻草的平均发育时间较长。了解 O. pugnax 在寄主草上的生长和发育速率可能有助于未来水稻病虫害综合治理策略的发展。pugnax 定居在首选的寄主草上。与所有其他 10 种草种相比，Oebalus pugnax 表现出对丛林草的偏好。Bahiagrass，Paspalum notatum Flueggé，是最不受欢迎的。无选择试验表明寄主草种对 O. pugnax 若虫存活至成虫的平均发育时间有显着影响。与水稻和丛林稻相比，若虫的存活率较低，且稻草的平均发育时间较长。了解 O. pugnax 在寄主草上的生长和发育速度可能有助于未来水稻病虫害综合治理策略的发展。pugnax 定居在首选的寄主草上。与所有其他 10 种草种相比，Oebalus pugnax 表现出对丛林草的偏好。Bahiagrass，Paspalum notatum Flueggé，是最不受欢迎的。无选择试验表明寄主草种对 O. pugnax 若虫存活至成虫的平均发育时间有显着影响。与水稻和丛林稻相比，若虫的存活率较低，且稻草的平均发育时间较长。了解 O. pugnax 在寄主草上的生长和发育速度可能有助于未来水稻病虫害综合治理策略的发展。无选择试验表明寄主草种对 O. pugnax 若虫存活至成虫的平均发育时间有显着影响。与水稻和丛林稻相比，若虫的存活率较低，且稻草的平均发育时间较长。了解 O. pugnax 在寄主草上的生长和发育速度可能有助于未来水稻病虫害综合治理策略的发展。无选择试验表明寄主草种对 O. pugnax 若虫存活至成虫的平均发育时间有显着影响。与水稻和丛林稻相比，若虫的存活率较低，且稻草的平均发育时间较长。了解 O. pugnax 在寄主草上的生长和发育速度可能有助于未来水稻病虫害综合治理策略的发展。